v3.26.1
Fair Value of Financial Instruments - Fair Value of Level 3 Investments at Fair Value and Significant Unobservable Inputs Used in Valuations (Details) - Level 3
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 3,177,854 $ 3,181,834
Income Approach | First-lien Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 2,942,965 $ 2,956,297
Income Approach | First-lien Debt Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.071 0.066
Income Approach | First-lien Debt Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.25 0.175
Income Approach | First-lien Debt Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.122 0.11
Income Approach | Second-lien Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 31,073 $ 30,456
Income Approach | Second-lien Debt Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.124 0.125
Income Approach | Second-lien Debt Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.157 0.153
Income Approach | Second-lien Debt Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.148 0.142
Income Approach | Mezzanine Debt Investments | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 63,752 $ 61,684
Income Approach | Mezzanine Debt Investments | Discount Rate | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.08 0.108
Income Approach | Mezzanine Debt Investments | Discount Rate | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.121 0.20
Income Approach | Mezzanine Debt Investments | Discount Rate | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.114 0.111
Market Multiple | Equity and Other Investments | Comparable Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value   $ 133,397
Market Multiple | Equity and Other Investments | Comparable Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input   0.018
Market Multiple | Equity and Other Investments | Comparable Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input   0.25
Market Multiple | Equity and Other Investments | Comparable Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input   0.104
Market Multiple | Equity Investments | Comparable Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 125,399  
Market Multiple | Equity Investments | Comparable Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.015  
Market Multiple | Equity Investments | Comparable Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.20  
Market Multiple | Equity Investments | Comparable Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Investment measurement input 0.109  
Market Multiple | Joint Venture Investments | Comparable Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 14,665